Latern slide cover

ABSTRACT

A frame has an inner edge, which has four sides defining an opening. A first leaf is joined to said frame at four sides of said inner edge. A second leaf is joined to said frame only at three sides of said inner edge.

United States Patent Hirsch et al. Aug. 29, 1972 54] LATERN SLIDE COVER [56] References Cited [72] Inventors: Karl Hirsch, Klagenfurt; Wilhelm UNITED STATES PATENTS Riedl, Klagenfurt; Siegmund Winkler, Wolfnitz; Hans Pirke 1,210,215 12/1916 Satterlee ..40/158 B X Portschach, all of Austria 1,136,163 4/1915 OBn'en ..40/159 1,477,131 12/1923 Kulik ..40/158 B [73] Assgnee' i z ggf fi' fi' f 1,810,649 6/1931 Elliot ..40/159 UX 3,339,303 9/1967 Anderson et a1. ..40/159 3,491,471 1/1970 Semple ..40/159 22 Filed: Oct. 7, 1970 [21] Appl. N0.: 78,671 Primary Examiner-Robert W. Michell Assistant Examiner-Wenceslao J. Contreras 30 Foreign Application Priority Data Mmmgue Oct. 20, 1969 Austria ..4A 9880/69 57 ABSTRACT 52 us. (:1 ..40/159 A frame has an inner edge which has four Sides defin- 51 1m. (:1 ..G09i 1/10 ing an Opening A first leaf is joined to Said frame at [58] Field 61 Search ..40/159, 158 B, 158, 16 four sides of said inner edge- A Second leaf isjoined to said frame only at three sides of said inner edge.

2 Claims, 2 Drawing Figures PATENTEDwsza 1912 I 3,686,784

INVENTORJ me mwpmu.

BY ww A RNEY LATERN SLIDE COVER This invention relates to a lantern slide cover and it is an object of the invention to provide improvements in the packaging and use (viewing) of lantern slides.

Lantern slides, particularly in large sizes above 60x90 millimeters have previously been packaged and kept in simple slip-in covers or in carton frames provided with a protective cover. These carton frames involve a more complicated manipulation. It is the purpose of the carton frames to eliminate a dazzling of the viewer of the slide by a light source or from illuminating boxes or the like and to facilitate the checking of the lantern slides. The mounting of the slides on the frames and the insertion of the frames into a protective cover are complicated and require a plurality of manipulations. More particularly, it is difficult to replace lantern slides which have been accommodated in the previous manner.

To eliminate the disadvantages which have been pointed out, the lantern slide cover according to the invention comprises two leaves, which are joined to the frame adjacent to its inner edge, which defines an opening, one leaf being joined to the frame at four sides of said edge and the other leaf being joined to said frame only at three sides of said edge, whereby a pocket is formed for accommodating the lantern slide.

According to the invention, the frame consists of opaque material, one leaf consists of transparent material and the other leaf consists of translucent and preferably dull material.

In one embodiment of the invention, the leaf of transparent material is provided on the viewing side of the other leaf and is joined to the rear side of the frame at four sides of the inner edge defining the opening of the frame whereas the leaf of dull material is somewhat offset from the transparent leaf and joined to the rear side of the frame only at three sides of said edge.

In one embodiment, the frame and the two leaves are made from hard polyvinylchloride and are joined by welding.

The lantern slide cover according to the invention can be made particularly easily from hard polyvinylchloride sheeting. The expenditure of material is small so that the manufacturing costs are low.

Special advantages result from the use of the lantern slide cover according to the invention because a lantern slide can very easily be inserted into and removed from the cover. On the other hand, the cover slides are safely accommodated in the cover and are protected against damage and substantially sealed against an ingress of dust. The viewing of the slides is also improved because the lantern slide cover according to the invention holds the slide in a plane and the leaves which define the pocket are in planar contact with the slide, without irregularities, so that there will be no distortion. The perfectly planar position of the slide and the diffuse light which is due to the use of the leaf of dull material enable an exact examination of the lantern slides. Another advantage resides in that the lantern slide cover according to the invention is particularly flat and much space can be saved when the slides are kept, e.g., in card index boxes.

Details of the invention will be explained more fully with reference to the drawing, which illustrates by way of example an embodiment of the lantern slide cover according to the invention.

Fl is a er ctive front view and a pe sp cfive rear view.

The transparency cover according to the invention consists of a frame 1, which is made from opaque material, preferably hard polyvinylchloride sheeting. The frame 1 has an opening 2. Leaves 3 and 4 are secured to the edge of said opening on opposite sides of the frame. The leaf 3 may consist of a transparent polyvinylchloride sheeting and may be welded to the underside of the frame 1 near its opening on four sides. The leaf 4 may consist of translucent and preferably dull material or a material having a milky appearance, e.g., a suitable polyvinylchloride sheeting, and is joined to the frame only on three sides by a seam weld 6 somewhat offset from the welded joint of the leaf 3.

The leaves 3 and 4 thus define a slip-in opening 5 for lantern slides.

The lantern slide cover according to the invention may be made in any desired size. Special advantages will be afforded by large-size lantern slide covers.

The invention has been explained with reference to the drawing only by way of example an is not restricted to the details which are illustrated and described.

What is claimed is:

1. A lantern slide cover, comprising a frame having an inner edge which has four sides defining an opening,

a first leaf joined on one side of said frame adjacent to four sides of said inner edge,

and a second leaf joined on said one side of said frame adjacent only to three sides of said inner edge,

said frame and said first and second leaves defining a pocket for accomodating a lantern slide,

said frame consists of opaque material,

said first leaf consists of a transparent material,

said second leaf consists of a dull translucent material of milky appearance,

said frame has a viewing side and a rear side,

said first leaf is joined to said rear side of said frame adjacent said four sides of said inner edge, said second leaf is secured to said rear side of said frame at only said three sides of said inner edge and on the side of said first leaf which is opposite to said viewing side of said frame, and

said second leaf is slightly offset from said first leaf.

2. A lantern slide cover as set forth in claim 1, in which said frame and said two leaves consist of hard polyvinylchloiide and are joined by welding at a position spaced from said inner edge of said opening. 

1. A lantern slide cover, comprising a frame having an inner edge which has four sides defining an opening, a first leaf joined on one side of said frame adjacent to four sides of said inner edge, and a second leaf joined on said one side of said frame adjacent only to three sides of said inner edge, said frame and said first and second leaves defining a pocket for accomodating a lantern slide, said frame consists of opaque material, said first leaf consists of a transparent material, said second leaf consists of a dull translucent material of milky appearance, said frame has a viewing side and a rear side, said first leaf is joined to said rear side of said frame adjacent said four sides of said inner edge, said second leaf is secured to said rear side of said frame at only said three sides of said inner edge and on the side of said first leaf which is opposite to said viewing side of said frame, and said second leaf is slightly offset from said first leaf.
 2. A lantern slide cover as set forth in claim 1, in which said frame and said two leaves consist of hard polyvinylchloride and are joined by welding at a position spaced from said inner edge of said opening. 